JPH06318917A - Remote supervisory system for broadcasting system - Google Patents

Abstract

PURPOSE:To enable remote supervisory even to the transmitting station of a simplified facility by enabling the transmission of the demodulated signal of a transmitter output and the abnormality supervisory signal of a transmitter from the transmitting station to a playing place by using a simplified transmission line. CONSTITUTION:Corresponding to the detected result of a detection circuit 5, a switching circuit 6 selects either the demodulated signal from a demodulating device or a tone signal from a tone oscillation circuit 4 and outputs the selected signal to a transmission line 7. The transmission line 7 transmits the signal from the switching circuit 6 to a distributing circuit 8. The distributing circuit 8 distributes the signal on the transmission line to a monitor circuit 9 and a tone detection circuit 10. The tone detection circuit 10 detects the tone signal from the signal distributed by the distributing circuit 8 and outputs the detected result to a supervisory circuit 11 as a supervisory signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote monitoring system for a broadcasting system, and more particularly to a method for monitoring an abnormality of a transmitter.

[0002]

2. Description of the Related Art Conventionally, in a broadcasting system, abnormality monitoring is performed on a transmitting device at a transmitting station of a simple facility such as a relay station, and an audio monitor signal is transmitted from the transmitting station to a playing room (studio) via a transmission line. The monitor signal is sent and monitored by an observer.

Alternatively, a remote monitoring device having a complicated system is installed at a transmitting station to perform unattended monitoring of the transmitting station. However, since a complicated system cannot be installed at a transmitting station having a simple facility such as the above-mentioned relay station, a transmission line is provided from the transmitting station to the playing station, and the abnormality monitoring for the transmitting device is performed by the above method. .

[0004]

In the above-mentioned conventional broadcasting system, the monitor signal of the voice sent from the transmitting station to the musical performance station via the transmission line is monitored by the monitoring person waiting at the musical performance station. Since the system is monitored by the means for judging the abnormality of the transmitting device by the auditor's hearing, the monitor waiting at the playing place monitors the voice sent through the transmission line. It is necessary to constantly monitor the signal.

Further, since only a transmission line for transmitting a monitor signal is provided between the transmitting station of a simple facility such as a relay station and the playing room, the remote monitoring using a remote monitoring device of a complicated system is performed. Can't do. Therefore, it is not possible to determine whether a serious abnormality has occurred or a minor abnormality has occurred at the transmitting station.

Therefore, an object of the present invention is to transmit the demodulated signal output from the transmitter and the abnormality monitoring signal of the transmitter from the transmitting station to the playing station through a single transmission line, and to transmit the simple equipment. It is an object of the present invention to provide a distant monitoring system of a broadcasting system which enables remote monitoring even in a place.

[0007]

A remote monitoring system for a broadcasting system according to the present invention includes demodulating means for extracting and demodulating an audio signal from a high frequency signal output from a transmitting device, and the demodulated signal demodulated by the demodulating means. A remote monitoring system for a broadcasting system, which outputs to a monitor via a transmission line,
It is characterized by comprising means for outputting an abnormality monitoring signal to the transmission line when detecting an abnormality of the transmitter, and means for detecting the abnormality monitoring signal from the signals on the transmission line.

In the remote monitoring system according to the present invention, the abnormality monitoring signal can be a tone signal.

In the remote monitoring system according to the present invention, at least one of the frequency and the voltage of the tone signal can be different from that of the demodulated signal.

The remote monitoring system according to the present invention further comprises means for continuously outputting the tone signal, and means for outputting the tone signal to the transmission line instead of the demodulated signal when an abnormality of the transmitter is detected. And means for detecting the tone signal from the signals on the transmission line.

The remote monitoring system according to the present invention may have means for judging from the difference in the voltage of the tone signal whether the broadcasting system is a serious failure or a minor failure.

[0012]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram of a first embodiment of the present invention. Referring to FIG. 1, in the first embodiment of the present invention, the output of the transmitter 1 is transmitted through an antenna 2, and a demodulation circuit 3 extracts a voice signal from the high frequency signal of this output and demodulates it. To be done. The demodulated signal demodulated by the demodulation circuit 3 is output to the switching circuit 6.

The tone oscillator circuit 4 continuously generates tone signals and outputs the tone signals to the switching circuit 6. The detection circuit 5 detects an abnormality in the transmission device 1 and outputs the detection result to the switching circuit 6.

The switching circuit 6 selects one of the demodulation signal from the demodulation circuit 3 and the tone signal from the tone oscillation circuit 4 according to the detection result of the detection circuit 5 and outputs it to the transmission line 7. The transmission line 7 transmits the signal from the switching circuit 6 to the distribution circuit 8.

The distribution circuit 8 distributes the signal transmitted through the transmission line 7 to the monitor circuit 9 and the tone detection circuit 10. The monitor circuit 9 monitors the signal distributed by the distribution circuit 8, and the tone detection circuit 10 detects a tone signal from the signal distributed by the distribution circuit 8 and outputs the detection result as a monitoring signal to the monitoring circuit 11. .

Next, the operation of the first embodiment will be described. Below, when the transmitter 1 is 100% modulated, a tailwind, an output level of ± 0 dBm, and an output of the tone oscillation circuit 4 are +1.
At 0 dBm, the detection level of the tone detection circuit 10 is + 5d.
A case of Bm or more will be described.

When the detection circuit 5 does not detect the abnormality of the transmitter 1, the switching circuit 6 selects the demodulated signal demodulated by the demodulation circuit 3, so that the demodulated signal is distributed via the transmission line 7 to the distribution circuit 8. Entered in. Distribution circuit 8 distributes the demodulated signal to monitor circuit 9 and tone detection circuit 10.

Therefore, the monitor can monitor the demodulated signal by the monitor circuit 9. at the same time,
The tone detection circuit 10 tries to detect a tone signal from the demodulated signal distributed by the distribution circuit 8. However, since the output level of the demodulated signal input at this time is ± 0 dBm, the tone signal is not detected.

On the other hand, when the detection circuit 5 detects the abnormality of the transmitter 1, the switching circuit 6 selects the tone signal from the tone oscillation circuit 4, so that the tone signal is sent to the distribution circuit 8 via the transmission line 7. Is entered. Distribution circuit 8 distributes the tone signal to monitor circuit 9 and tone detection circuit 10.

Therefore, the monitor can monitor the tone signal by the monitor circuit 9. At the same time, the tone detection circuit 10 detects a tone signal from the tone signal distributed by the distribution circuit 8. That is, the output level of the tone signal input at this time is +10 dBm.
Therefore, the tone detection circuit 10 detects the tone signal and outputs the supervisory signal to the supervisory circuit 11.

In the above description, the case where the output level of the demodulated signal demodulated by the demodulation circuit 3 and the output level of the tone signal from the tone oscillation circuit 4 are different from each other has been described. The frequency of the demodulated signal and the frequency of the tone signal from the tone oscillation circuit 4 may be different from each other.

For example, when the oscillation frequency of the tone signal from the tone oscillation circuit 4 is 5 kHz, the tone signal can be detected by providing the tone detection circuit 10 with a bandpass filter that passes 5 kHz.

The output level and frequency of the demodulated signal demodulated by the demodulation circuit 3 may be different from the output level and frequency of the tone signal from the tone oscillation circuit 4. In this case, the tone detection circuit 10 may be configured so that a tone signal having an output level and frequency different from that of the demodulated signal can be detected.

As described above, the tone oscillation circuit 4, the detection circuit 5, the switching circuit 6 for outputting the abnormality monitoring signal to the transmission line 7 when the abnormality of the transmitter 1 is detected, and the signal on the transmission line. Tone detection circuit 1 for detecting the tone signal from the
By including 0, the demodulated signal of the output of the transmission device 1 and the abnormality monitoring signal of the transmission device 1 are transmitted to the independent transmission line 7
This allows transmission from the transmitting station to the playing station. Therefore, it is possible to perform remote monitoring even for a simple transmitting station such as a relay station.

FIG. 2 is a block diagram of the second embodiment of the present invention. Referring to FIG. 2, in the second embodiment of the present invention, in order to combine the tone signal and the demodulated signal when the transmitter 1 is abnormal, the switching circuit 12 and the combining circuit 13 are combined.
Is provided, which is different from the first embodiment.

In the second embodiment, when the transmitter 1 is normal, the voice signal demodulated by the demodulation circuit 3 is sent to the distribution circuit 8 via the transmission line, as in the case of the first embodiment. To be

When the transmitter 1 is abnormal, the switching circuit 12 is closed and the tone signal from the tone oscillation circuit 4 is sent to the synthesis circuit 13. The synthesis circuit 13 synthesizes the sound signal from the demodulation circuit 3 and the tone signal sent from the tone oscillation circuit 4 via the switching circuit 12.
The combined signal is sent to the distribution circuit 8 via the transmission line 7.

Now, the level of the demodulated signal is 10 in the transmitter 1.
± 0 dBm at 0% modulation, tone signal level +10
dBm, the detection level of the tone detection circuit 10 is +5 dBm
If so, the tone detection circuit 10 performs the following operation.

That is, when the transmitter 1 is normal, the switching circuit 12 cuts off the supply of the tone signal to the synthesis circuit 13, so that the level input to the tone detection circuit 10 is ± 0 dBm at maximum. The tone detection circuit 10 does not operate (does not detect a tone signal).

When the transmitter 1 is abnormal, the voice signal from the demodulation circuit 3 and the tone signal from the tone oscillation circuit 4 are combined in the combining circuit 13, and are input to the tone detecting circuit 10. The level is at least +10 dBm, which is the sum of the demodulation signal level and the tone signal level, and the tone signal is detected.

FIG. 3 is a block diagram of the third embodiment of the present invention. Referring to FIG. 3, in the third embodiment of the present invention, a serious failure detection circuit 14 is provided in addition to the detection circuit 5 in the first embodiment, and the tone oscillation circuit 4 is replaced by the first and second circuits. Tone oscillator circuits 4A and 4B are provided, and these tone oscillator circuits 4A and 4B are also provided.
A switching circuit 15 for switching the tone signal from B is provided.

The serious failure detection circuit 14 determines whether the abnormality of the transmitter 1 is a serious abnormality such as a wave stoppage or no modulation, or the antenna power is reduced within the allowable range of the Radio Regulations, or the lamp of the display board is turned off. Detects whether it is a minor abnormality such as a break. The levels of the first and second tone signals from the first and second tone oscillator circuits 4A and 4B are set to +10 dBm and ± 0 dBm, respectively.

In the third embodiment, when the transmitter 1 is normal, the audio signal demodulated by the demodulation circuit 3 is distributed via the transmission line 7 to the distribution circuit 8 as in the case of the first embodiment.
Sent to.

When a serious abnormality occurs in the transmitter 1, the switching circuit 15 selects the first tone signal from the first tone oscillation circuit 4A. In the case of a slight abnormality, the switching circuit 15 selects the second tone signal from the second tone oscillation circuit 4B.

The detection level of the tone detection circuit 10 is set to + 5d.
When Bm is set, the tone detection circuit 10 performs the following operation.

When the transmitter 1 is normal, the level of the tone signal input to the tone detection circuit 10 is ± 0d at maximum.
Since it is Bm, the tone detection circuit 10 does not detect the tone signal. The monitor circuit 9 allows the monitor to monitor the audio signal output from the transmitter 1.

When a slight abnormality occurs in the transmitter 1,
The level of the second tone signal input to the tone detection circuit 10 is ± 0 dBm at maximum, so the tone detection circuit 1
0 does not detect a tone signal. The monitor circuit 9 allows the monitor to monitor the second tone signal.

When a serious abnormality occurs in the transmitter 1,
Since the level of the first tone signal input to the tone detection circuit 10 is +10 dBm, the tone detection circuit 10
Detects the tone signal. The monitor circuit 9 allows the monitor to monitor the first tone signal.

FIG. 4 is a block diagram of the fourth embodiment of the present invention. Referring to FIG. 4, in the fourth embodiment of the present invention, instead of the tone oscillation circuits 4A and 4B and the switching circuit 15 in the third embodiment, the tone oscillation circuit 4 (tone oscillation in the first embodiment is Same circuit), attenuator 16 and attenuator control circuit 1
7 is provided.

The attenuator control circuit 17 controls the attenuation amount of the attenuator 16 according to the detection result from the serious failure detection circuit 14. That is, in the case of a serious abnormality, the attenuation amount in the attenuator 16 is set to 0 and the tone oscillation circuit 4
Do not change the level of the tone signal from. In the case of a slight abnormality, the attenuation amount at the attenuator 16 is 10
It is controlled to be dBm.

In the fourth embodiment, when the transmitter 1 is normal, the voice signal demodulated by the demodulation circuit 3 is distributed via the transmission line 7 to the distribution circuit 8 as in the case of the first embodiment.
Sent to.

Now, the output of the demodulation circuit 3 is 10 of the transmitter 1.
± 0 dBm at 0% modulation, output of tone oscillation circuit 4 is +10 dBm, attenuation of attenuator 16 is 10
dBm, the detection level of the tone detection circuit 10 is +5 dBm
Then, the tone detection circuit 10 operates as follows.

When the transmitter 1 is normal, the level of the tone signal input to the tone detection circuit 10 is ± 0d at maximum.
Since it is Bm, the tone detection circuit 10 does not detect the tone signal. The monitor circuit 9 allows the monitor to monitor the audio signal output from the transmitter 1.

When a slight abnormality occurs in the transmitter 1,
The level of the second tone signal input to the tone detection circuit 10 is ± 0 dBm at maximum, so the tone detection circuit 1
0 does not detect a tone signal. The monitor circuit 9 allows the monitor to monitor the second tone signal.

When a serious abnormality occurs in the transmitter 1,
Since the level of the first tone signal input to the tone detection circuit 10 is +10 dBm, the tone detection circuit 10
Detects the tone signal. The monitor circuit 9 allows the monitor to monitor the first tone signal.

[0047]

As described above, according to the present invention,
By having means for outputting an abnormality monitoring signal to the transmission line when detecting an abnormality in the transmission device and means for detecting the abnormality monitoring signal from the signals on the transmission line, the demodulated signal output from the transmission device and the transmission The abnormality monitoring signal of the device can be transmitted from the transmitting station to the playing station through a single transmission line, and remote monitoring can be performed even for a simple transmitting station.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a block diagram of a second embodiment of the present invention.

FIG. 3 is a block diagram of a third embodiment of the present invention.

FIG. 4 is a block diagram of a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 transmitter 2 antenna 3 demodulation circuit 4 tone oscillation circuit 5 detection circuit 6 switching circuit 7 transmission line 8 distribution circuit 9 monitor circuit 10 tone detection circuit 11 monitoring circuit 12 switching circuit 13 synthesis circuit 14 severe failure detection circuit 15 switching circuit 16 attenuator 17 Attenuator control circuit

Claims (5)

[Claims] 1. A remote monitoring system of a broadcasting system including demodulation means for extracting and demodulating a voice signal from a high frequency signal output from a transmitter, and outputting the demodulated signal demodulated by the demodulation means to a monitor via a transmission line. And a means for outputting an abnormality monitoring signal to the transmission line when an abnormality of the transmission device is detected, and a means for detecting the abnormality monitoring signal from the signals on the transmission line. Remote monitoring system. 2. The remote monitoring system according to claim 1, wherein the abnormality monitoring signal is a tone signal. 3. The remote monitoring system according to claim 2, wherein at least one of frequency and voltage of the tone signal is different from that of the demodulated signal. 4. A means for continuously outputting the tone signal,
Means for outputting the tone signal to the transmission line instead of the demodulated signal when detecting an abnormality of the transmitter,
4. The remote monitoring system according to claim 2, further comprising means for detecting the tone signal from the signals on the transmission line. 5. The apparatus according to claim 2, further comprising means for judging whether the broadcasting system is a serious failure or a minor failure from the voltage difference between the tone signals.
The remote monitoring system according to any one of 4 above.